Rigid entry fitting for flexible pipe

ABSTRACT

A rigid entry fitting configured to form a seal between a flexible pipe segment and a sump wall includes a fitting body having an inner surface defining a tapered opening, an insert received in the tapered opening, a shell received in an opening of the insert, a first pair of gaskets between an outer surface of the insert and the inner surface of the fitting body, a second pair of gaskets contacting an inner surface of the shell and opposite ends of the insert, and a nut configured to engage threads on an outer surface of the fitting body. When the nut is threaded onto the threads, the nut presses the shell and the insert into the tapered opening and presses the first pair of gaskets against the inner surface of the fitting body and the second pair of gaskets against the outer surface of the flexible pipe segment.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation of U.S. patent application Ser. No.16/162,862, filed Oct. 17, 2018, which claims priority to and thebenefit of U.S. Provisional patent Application No. 62/573,600, filed onOct. 17, 2017 with the U.S. Patent and Trademark Office, the entirecontents of which are incorporated herein by reference.

FIELD

The present disclosure relates generally to entry fittings for flexiblepipes passing through sumps.

BACKGROUND

Underground storage tank (UST) fueling sites, such as retail gasstations, typically include pipelines carrying a product such asgasoline from the storage tank to a product dispenser. A sump istypically provided beneath the product dispenser to contain any fuelreleased from failed equipment and thereby prevent environmentalcontamination (e.g., ground water contamination) under and around theservice station. Each pipeline extends through an aperture in the wallof the sump to a pipe fitting which connects the pipeline to the productdispenser.

The aperture in the sump wall through which the pipeline penetrates mustbe sealed to prevent the accumulated fuel in the sump from leakingthrough the aperture in the sump wall and into the surrounding ground.Accordingly, penetration fittings are commonly provided to form sealsbetween the sumps and the associated pipelines to contain fuel leakagewithin the sumps. However, penetration fittings commonly includecomponents, such as gaskets and boots, that are made from a materialhaving a relatively low chemical resistance that tend to degrade andfail quickly in the harsh sump environment, and conventional penetrationfittings require excavation of the backfill area surrounding the sump toreplace worn components of the penetration fitting. Additionally, manyconventional penetration fittings are not configured for use withdouble-walled sumps that enable pressure testing and monitoring of theintegrity of the seals formed by the penetration fitting.

SUMMARY

The present disclosure is directed to various embodiment of a rigidentry fitting configured to form a seal between a pipe segment and asump wall at an aperture in the sump wall through which the pipe segmentpasses. In one embodiment, the rigid entry fitting includes a fittingbody having an inner surface defining a tapered opening and an outersurface opposite the inner surface, an insert configured to be receivedin the tapered opening, a shell configured to be received in an openingof the insert and defining an opening configured to accommodate the pipesegment, a first pair of gaskets configured to form a seal between anouter surface of the insert and the inner surface of the fitting body, asecond pair of gaskets configured to form a seal with an outer surfaceof the pipe segment, and a nut configured to engage the fitting body.When the rigid entry fitting is assembled around the pipe segment, thenut is configured to press the shell and the insert into the taperedopening of the fitting body, and press the first pair of gaskets againstthe inner surface of the fitting body and the second pair of gasketsagainst the outer surface of the pipe segment.

When the rigid entry fitting is assembled, the second pair of gasketsmay contact an inner surface of the insert and opposite ends of theshell.

The fitting body may define a first radial opening, the insert maydefine a second radial opening, the shell may define a third radialopening. When the rigid entry fitting is assembled around the pipesegment and coupled to the sump wall, the first, second, and thirdradial openings define a communication path from an interstice of thesump wall to the pipe.

The fitting body may also include a flange configured to be coupled toan exterior surface of the sump wall.

The rigid entry fitting may also include a flange configured to fit overthe outer surface of the fitting body and configured to be coupled to aninterior surface of the sump wall opposite the exterior surface of thesump wall.

The rigid entry fitting may also include a pair of annular grooves inthe outer surface of the insert. The pair of annular grooves isconfigured to accommodate the first pair of gaskets.

When the first pair of gaskets is received in the pair of annulargrooves, the first pair of gaskets may extend beyond the outer surfaceof the insert.

The nut may include a cap, an outer sleeve extending from the cap, andan inner projection extending from the cap.

The outer surface of the fitting body may include outer threads, and aninner surface of the outer sleeve may include inner threads configuredto engage the outer threads of the fitting body.

When the rigid entry fitting is assembled and the nut is threaded ontothe fitting body, the inner projection of the nut may engage an interiorgasket of the second pair of gaskets.

The second pair of gaskets may be larger than the first pair of gaskets.

The first pair of gaskets may include a first pair of O-rings eachhaving a first diameter, and the second pair of gaskets may include asecond pair of O-rings each having a second diameter larger than thefirst diameter.

An outer surface of the insert may taper and may substantially match theinner surface of the fitting body when the rigid entry fitting isassembled around the pipe segment.

The present disclosure is also directed to various embodiments of arigid entry fitting configured to form a seal between a pipe segment anda sump double wall at an aperture in the sump double wall through whichthe pipe segment passes. In one embodiment, the rigid entry fittingincludes a fitting body having an inner surface defining a taperedopening and an outer surface opposite the inner surface, an insertconfigured to be received in the tapered opening, a shell configured tobe received in an opening of the insert and defining an openingconfigured to accommodate the pipe segment, and a nut configured toengage the fitting body. When the rigid entry fitting is installedaround the pipe segment, a first fluid-tight seal is formed, a secondfluid-tight seal is formed, and a communication path is defined in thefitting body, the insert, and the shell. The communication path isbetween the first and second fluid-tight seals and extends from aninterstice of the sump double wall to the pipe segment.

The rigid entry fitting may include a first pair of gaskets configuredto form a seal between an outer surface of the insert and the innersurface of the fitting body, and a second pair of gaskets configured toform a seal with an outer surface of the pipe segment. An exteriorgasket of the first pair of gaskets and an exterior gasket of the secondpair of gaskets define the first fluid-tight seal when the rigid entryfitting is installed around the pipe segment. An interior gasket of thefirst pair of gaskets and an interior gasket of the second pair ofgaskets define the second fluid-tight seal when the rigid entry fittingis installed around the pipe segment.

The fitting body may define a first radial opening, the insert maydefine a second radial opening, and the shell may define a third radialopening. When the rigid entry fitting is assembled, the first, second,and third radial openings define at least a portion of the communicationpath from the interstice of the sump double wall to the flexible pipe.

The first, second, and third radial openings may be longitudinallyoffset from each other.

When the rigid entry fitting is installed around the pipe segment, thefirst radial opening may be at least partially aligned with theinterstice of the sump double wall.

The fitting body may include an inner surface defining a taperedopening.

This summary is provided to introduce a selection of features andconcepts of embodiments of the present disclosure that are furtherdescribed below in the detailed description. This summary is notintended to identify key or essential features of the claimed subjectmatter, nor is it intended to be used in limiting the scope of theclaimed subject matter. One or more of the described features may becombined with one or more other described features to provide a workabledevice.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features and advantages of embodiments of the presentdisclosure will become more apparent by reference to the followingdetailed description when considered in conjunction with the followingdrawings. In the drawings, like reference numerals are used throughoutthe figures to reference like features and components. The figures arenot necessarily drawn to scale.

FIG. 1 is an exploded cross-sectional view of a rigid entry fittingaccording to one embodiment of the present disclosure; and

FIG. 2 is an assembled cross-sectional view of the embodiment of therigid entry fitting illustrated in FIG. 1 forming a seal around a pipepenetrating a sump wall.

DETAILED DESCRIPTION

The present disclosure is directed to various embodiments of a rigidentry fitting. The rigid entry fitting is configured to create one ormore fluid-tight seals around a pipe penetrating a sump wall. In one ormore embodiments, the rigid entry fitting is configured for use withdouble wall sumps configured to test and monitor the integrity of theseals formed between the rigid entry fitting and the pipe (i.e., therigid entry fitting is configured for use with double wall monitoredsystems). Additionally, in one or more embodiments, the rigid entryfitting is configured to enable replacement of worn seals (e.g.,O-rings) without requiring excavation of the backfill area surroundingthe sump.

With reference now to FIGS. 1-2 , a rigid entry fitting 100 according toone embodiment of the present disclosure is configured to form afluid-tight seal between a pipe 200 and a sump wall 300 (e.g., a sumpdouble wall) at an aperture or opening 301 in the sump wall 300 throughwhich the pipe 200 passes. In one or more embodiments, the pipe 200 isconfigured to deliver fuel from an underground storage tank (UST) to afuel dispenser at a fueling site, such as a retail gas station.Additionally, in one or more embodiments, the pipe 200 may include aninner primary pipeline through which the fuel flows and an outersecondary pipeline surrounding the inner primary pipeline configured tocontain any fuel that may lead from a damaged inner primary pipeline. Inthe illustrated embodiment, the rigid entry fitting 100 includes afitting body 101, an insert 102, a shell 103, a flange 104, a first pair(e.g., an outer pair) of gaskets 105, 106, a second pair (e.g., an innerpair) of gaskets 107, 108, and a compression nut 109. In one or moreembodiments, the gaskets 105-108 may be O-rings formed of an elastomericmaterial, such as rubber. In one or more embodiments, the gaskets105-108 may be formed of any other suitable material and may have anyother suitable configuration for forming fluid-tight seals.

In the illustrated embodiment, the fitting body 101 includes an innersurface 110 and an outer surface 111 opposite the inner surface 110. Inthe illustrated embodiment, at least a portion of the inner surface 110defines a tapered opening 112 that tapers between a wider end 113 and anarrower end 114. In one or more embodiments, when the rigid entryfitting 100 is coupled to the sump wall 300, as illustrated in FIG. 2 ,the narrower end 114 of the inner surface 110 of the fitting body 101 isproximate to the sump wall 300 and the wider end 113 of the of the innersurface 110 of the fitting body 101 is distal to the sump wall 300.Additionally, in the illustrated embodiment, when the rigid entryfitting 100 is coupled to the sump wall 300, the wider end 113 of theinner surface 110 of the fitting body 101 is accommodated in an innerchamber or cavity 302 defined by the sump wall 300 and the narrower end114 is outside of the inner chamber 302 of the sump wall 300. In one ormore embodiments, when the rigid entry fitting 100 is coupled to thesump wall 300, both the wider end 113 and the narrower end 114 of thefitting body 101 may be in the inner chamber 302 of the sump wall 300.

Additionally, in the illustrated embodiment, the fitting body 101includes a flange 115 configured to be bonded to an exterior surface 303of the sump wall 300 surrounding the opening 301 in the sump wall 300.In the illustrated embodiment, the flange 115 extends outward (e.g.,radially outward) from the outer surface 111. The flange 104 is anannular member configured to slide over the outer surface 111 of thefitting body 101 and be bonded to an interior surface 304 of the sumpwall 300 surrounding the opening 301 (e.g., the flange 115 of thefitting body 101 and the flange 104 are configured to engage oppositesurfaces 303, 304 of the sump wall 300). Additionally, in one or moreembodiments, the configuration (e.g., shape and size) of the flange 115may be the same or substantially the same as the configuration (e.g.,shape and size) of the flange 104. In one or more embodiments, thefitting body 101 may be configured to be coupled to the sump wall 300 inany other suitable manner, such as with a mechanical compression fitting(e.g., one or more fasteners and a gasket).

As shown in the embodiment illustrated in FIGS. 1-2 , the insert 102 isconfigured to be received in the tapered opening 112 of the fitting body101 (i.e., the tapered opening 112 is configured to accommodate theinsert 102). In the illustrated embodiment, the insert 102 is an annularmember including an inner surface 116 and an outer surface 117 oppositethe inner surface 116. The inner surface 116 defines an opening 118. Inthe illustrated embodiment, the outer surface 117 tapers between a widerend 119 and a narrower end 120 opposite the wider end 119. In one ormore embodiments, when the rigid entry fitting 100 is coupled to thesump wall 300, as illustrated in FIG. 2 , the narrower end 120 of theouter surface 117 of the insert 102 is proximate to the sump wall 300and the wider end 119 of the outer surface 117 is distal to the sumpwall 300. Additionally, in the illustrated embodiment, when the rigidentry fitting 100 is coupled to the sump wall 300, the wider end 119 ofthe outer surface 117 of the insert 102 is accommodated in the innerchamber 302 defined by the sump wall 300 and the narrower end 120 isoutside of the inner chamber 302 of the sump wall 300. In one or moreembodiments, when the rigid entry fitting 100 is coupled to the sumpwall 300, both the wider end 119 and the narrower end 120 of the insert102 may be in the inner chamber 302 of the sump wall 300. In one or moreembodiments, the outer surface 117 of the insert 102 conforms orsubstantially conforms to the inner surface 110 of the fitting body 101(e.g., the tapered outer surface 117 of the insert 102 matches orsubstantially matches the tapered inner surface 110 of the fitting body101).

Additionally, in the illustrated embodiment, the insert 102 includes anoutwardly-extending lip 121 extending away from the opening 118 (e.g.,an outwardly-extending rim) at the wider end 119 of the insert 102, andan inwardly-extending lip 122 extending into the opening 118 (e.g., aninwardly-extending rim) at the narrower end 120 of the insert 102. Inone or more embodiments, the outwardly-extending lip 121 and/or theinwardly-extending lip 122 may extend radially relative to a centerlineL of the insert 102. In the illustrated embodiment, the inner surface116 of the insert 102 is straight or substantially straight except atthe inwardly-extending lip 122 (e.g., the inner surface 116 of theinsert 102 is at a constant or substantially constant distance from thecenterline L, except at the inwardly-extending lip 122) such that theopening 118 defined by the inner surface 116 of the insert 102 isstraight or substantially straight except at the inwardly-extending lip122.

In the illustrated embodiment, the outer surface 117 of the insert 102also defines a pair of annular grooves or recesses 123, 124 configuredto accommodate the first pair of gaskets 105, 106, respectively. Whenthe rigid entry fitting 100 is assembled, as illustrated in FIG. 2 , thegaskets 105, 106 are received in the annular grooves 123, 124,respectively, protrude beyond the outer surface 117 of the insert 102,and contact the inner surface 110 of the fitting body 101 to form aliquid-tight seal. In the illustrated embodiment, the gaskets 105, 106form a sliding seal with the inner surface 110 of the fitting body 101.

In the embodiment illustrated in FIGS. 1-2 , the shell 103 is configuredto be received in the opening 118 of the insert 102 (i.e., the opening118 of the insert 102 is configured to accommodate the shell 103). Inthe illustrated embodiment, the shell 103 is an annular member includingan inner surface 125 and an outer surface 126 opposite the inner surface125. The inner surface 125 defines an opening 127 configured toaccommodate the pipe 200 penetrating the opening 301 in the sump wall300 (e.g., when the rigid entry fitting 100 is installed, as illustratedin FIG. 2 , the pipe 200 extends through the opening 127 of the insert102). In the illustrated embodiment, the outer surface 126 of the shell103 conforms or substantially conforms to the inner surface 116 of theinsert 102. In the illustrated embodiment, the outer surface 126 of theshell 103 is straight or substantially straight (e.g., the outer surface126 of the shell 103 does not taper) and the straight or substantiallystraight outer surface 126 of the shell 103 matches or substantiallymatches the straight or substantially straight inner surface 116 of theinsert 102, or at least a portion thereof. In one or more embodiments,the outer surface 126 of the shell 103 and the inner surface 116 of theinsert 102 may each taper.

In the illustrated embodiment, when the rigid entry fitting 100 isassembled, as illustrated in FIG. 2 , the exterior gasket 107 of thesecond pair of gaskets 107, 108 (e.g., the gasket 107 proximate to thesump wall 300) is positioned between a forward end 128 of the shell 103and the inwardly-extending lip 122 at the narrower end 120 of the insert102, and the interior gasket 108 of the second pair of gaskets 107, 108(e.g., the gasket 108 distal to the sump wall 300) contacts a rear end129 of the shell 103 opposite the forward end 128 (e.g., the gaskets107, 108 contact opposite ends 128, 129, respectively, of the shell103). As described in more detail below, the gaskets 107, 108 areconfigured to form a fluid-tight seal against the pipe 200.

In the illustrated embodiment, the gaskets of the second pair of gaskets107, 108 are larger than the gaskets of first pair of gaskets 105, 106(e.g., a diameter of each of the inner O-rings 107, 108 is larger than adiameter of each of the outer O-rings 105, 106). Providing relativelylarger inner gaskets 107, 108 (e.g., larger inner O-rings) is configuredto accommodate an oblong pipe 200 (e.g., relatively larger inner gaskets107, 108 are configured to form a fluid-tight seal against an oblongpipe 200).

In the embodiment illustrated in FIGS. 1-2 , the compression nut 109includes a cap 130, an outer sleeve 131 extending (e.g., extendinglongitudinally) from the cap 130, and an inner projection 132 extending(e.g., extending longitudinally) from the cap 130. In the illustratedembodiment, the outer sleeve 131 and the inner projection 132 extend inthe same or substantially the same direction from the cap 130. When therigid entry fitting 100 is assembled, as illustrated in FIG. 2 , thecompression nut 109 is accommodated inside the inner chamber 302 definedby the sump wall 300 and the outer sleeve 131 and the inner projection132 of the compression nut 109 both extend toward the sump wall 300. Inthe illustrated embodiment, an inner surface 133 of the outer sleeve 131includes internal threads 134 configured to engage external threads 135on the outer surface 111 of the fitting body 101. In one or moreembodiments, the outer sleeve 131 is spaced outwardly apart from theinner projection 132 of the compression nut 109 by a distance that isequal or substantially equal to a combined thickness of the fitting body101 and the insert 102 (e.g., the outer sleeve 131 is spaced outwardlyapart from the inner projection 132 of the compression nut 109 by adistance that is equal or substantially equal to a sum of the distancebetween the inner and outer surfaces 110, 111 of the fitting body 101and the distance between the inner and outer surfaces 125, 126 of theinsert 102). The inner projection 132 of the compression nut 109 isconfigured to engage the interior gasket 108 of the second pair ofgaskets 107, 108. The compression nut 109 also defines an opening 136configured to accommodate the flexible pipe 200 (e.g., when the rigidentry fitting 100 is installed, the pipe 200 passes through the opening136 of the compression nut 109). In the illustrated embodiment, theinner projection 132 extends around the opening 136 in the compressionnut 109.

To install the rigid entry fitting 100 and form a seal around the pipe200 passing through the opening 301 in the sump wall 300, the fittingbody 101 is inserted through the opening 301 and coupled to the exteriorsurface 303 of the sump wall 300 around the opening 301 (e.g., bybonding the flange 115 to the portion of the exterior surface 303 of thesump wall 300 surrounding the opening 301 in the sump wall 300 and/or bycoupling the fitting body 101 to the sump wall 300 with a mechanicalcompression fitting, such as with a gasket and fasteners).

Installing the rigid entry fitting 100 also includes installing thefirst pair of gaskets 105, 106 on the outer surface 117 of the insert102. In one or more embodiments, the first pair of gaskets 105, 106 maybe installed in the annular grooves 123, 124, respectively, in the outersurface 117 of the insert 102. As described above, in one or moreembodiments, when the first pair of gaskets 105, 106 may be installed inthe annular grooves 123, 124, respectively, the first pair of gaskets105, 106 extend outward beyond the outer surface 117 of the insert 102.

The insert 102 and the shell 103 may then be inserted into the taperedopening 112 of the fitting body 101 from the interior chamber 302defined by the sump wall 300. In one embodiment, the insert 102 isinserted into the tapered opening 112 of the fitting body 101 and thenthe shell 103 is inserted into the opening 118 of the insert 102. Inanother embodiment, the shell 103 may be inserted into the opening 118of the insert 102 and then the insert 102 and the shell 103 may beinserted together into the tapered opening 112 of the fitting body 101.In either case, the exterior gasket 107 of the second pair of gaskets107, 108 is inserted into the opening 118 of the insert 102 ahead of theshell 103. When the exterior gasket 107 is installed, as illustrated inFIG. 2 , the exterior gasket 107 contacts the inner surface 116 and theinwardly-extending lip 122 of the insert 102. The inwardly-extending lip122 is configured to retain the exterior gasket 107 in the opening 118.The interior gasket 108 of the second pair of gaskets 107, 108 may thenbe inserted into the opening 118 of the insert 102 following the shell103. When the interior gasket 108 is installed, as illustrated in FIG. 2, the interior gasket 108 contacts the inner surface 116 of the insert102 and the rear end 129 of the shell 103. In one or more embodiments,the exterior gasket 107 may be connected (e.g., bonded) to the forwardend 128 of the shell 103 and the interior gasket 108 may be connected(e.g., bonded) to the rear end 129 of the shell 103 such that the secondpair of gaskets 107, 108 and the shell 103 are inserted together intothe opening 118 of the insert 102. Additionally, as the insert 102 isinserted into the opening 112 of the fitting body 101, the tapered innersurface 110 of the fitting body 101 and the corresponding tapered outersurface 117 of the insert 102 cooperate to compress (e.g., deform) thefirst pair of gaskets 105, 106 against the inner surface 110 of thefitting body 101. Furthermore, in the illustrated embodiment, theoutwardly-extending lip 121 of the insert 102 is configured to contactthe fitting body 101 and thereby function as a stop limiting furtherinsertion of the insert 102 into the opening 112 of the fitting body101.

The compression nut 109 may then be installed. In one or moreembodiments, the compression nut 109 may be installed by threading thethreads 134 of the compression nut 109 onto the threads 135 on the outersurface 111 of the fitting body 101. As the compression nut 109 isthreaded onto the threads 135 on the outer surface 111 of the fittingbody 101, the inner projection 132 of the compression nut 109 extendsinto the opening 118 of the insert 102, engages the interior gasket 108of the second pair of gaskets 107, 108, and presses the interior gasket108 against the rear end 129 of the shell 103 and an outer surface 201of the pipe 200. Additionally, the compressive force applied by thecompression nut 109 to the interior gasket 108 is transmitted throughthe shell 103 to the exterior gasket 107, which presses the exteriorgasket 107 of the second pair of gaskets 107, 108 against theinwardly-extending lip 122 of the insert 102 and the outer surface 201of the pipe 200. The deformation (e.g., compression) of the gaskets 107,108 is configured to form a seal against the pipe 200 penetrating theopening 301 in the sump wall 300. Accordingly, the interior gaskets 106,108 are configured to form a first fluid-tight seal (e.g., an interiorseal) and the exterior gaskets 105, 107 are configured to form a secondfluid-tight seal (e.g., an exterior seal).

The separate insert 102 and shell 103 components provide access to thegaskets 105-108 through the interior chamber 302 the sump wall 300without excavation (e.g., without requiring excavation of the backfillarea around the sump wall 300). Access to the gaskets 105-108facilitates servicing the gaskets 105-108 due to wear (e.g., facilitatesreplacement or retrofitting of the gaskets 105-108). For instance, inone or more embodiments, if the gaskets 105-108 chemically degrade dueto exposure to the harsh sump environment or otherwise fail, thecompression nut 109 may be detached from the fitting body 101 and thenthe insert 102 and the shell 103 may be removed from the tapered opening112 of the fitting body 101 to enable removal and replacement of thegaskets 105-108. Additionally, providing the insert 102 and the shell103 as separate components enables removal of the insert 102 and theshell 103 to increase the inner diameter of the entry fitting 100.Increasing the inner diameter of the entry fitting 100 enablesretraction of the pipe 200 from the opening 301 in the sump wall 300.Furthermore, providing the insert 102 and the shell 103 as separateremovable components is configured to reduce the amount of deformation(e.g., compression) that is required on the gaskets 105-108 to formfluid-tight seals compared to a rigid entry fitting in which the insertand the shell are a single monolithic component.

With continued reference to the embodiment illustrated in FIGS. 1-2 ,the fitting body 101, the insert 102, and the shell 103 each include oneor more radial openings 137, 138, 139, respectively. Together, theradial openings 137, 138, 139 define a communication path from aninterstice 305 of the sump wall 300 (e.g., a space between a double wallof the sump wall 300) to the pipe 200. The communication path enablespressure testing and monitoring of the integrity of the seals formed bythe gaskets 105-108, and it makes the rigid entry fitting 100 compliantwith vacuum, pressure, or hydrostatic (VPH) methods for continuousmonitoring of the interstice 305 of the sump double wall 300. In theillustrated embodiment, the one or more radial openings 139 in the shell103 are located at an intermediate portion of the shell 103 between theends 128, 129, the one or more radial openings 138 in the insert 102 arelocated at an intermediate portion of the insert 102 between the widerand narrower ends 119, 120, and the one or more radial openings 137 inthe fitting body 101 are located between the flange 115 and the widerend 113 of the tapered opening 112. In the illustrated embodiment, theradial openings 137, 138, 139 are each positioned longitudinally betweenthe exterior gaskets 105, 107 and interior gaskets 106, 108.Additionally, the radial openings 137, 138, 139 in the fitting body 101,the insert 102, and the shell 103, respectively, are longitudinallyoffset from each other. In the illustrated embodiment, the one or moreradial openings 137 in the fitting body 101 is at least partiallyaligned with the interstice 305 of the sump wall 300. Furthermore, inthe illustrated embodiment, the first seal formed by the interiorgaskets 106, 108 and the second seal formed by the exterior gaskets 105,107 are on opposite sides of the interstice 305 of the sump double wall300. In the illustrated embodiment, the communication path from theinterstice 305 of the sump wall 300 to the outer surface 201 of the pipe200 extends through the radial opening 137 in the fitting body 101,along an interface between the outer surface 117 of the insert 102 andthe inner surface 110 of the fitting body 101, through the radialopening 138 in the insert 102, along an interface between the outersurface 126 of the shell 103 and the inner surface 116 of the insert102, and through the radial opening 139 of the shell 103, which opens tothe outer surface 201 of the pipe 200. In one or more embodiments, oneor more of the radial openings 137, 138, 139 may be at least partiallyaligned (e.g., aligned or substantially aligned) or with each other.

While this invention has been described in detail with particularreferences to embodiments thereof, the embodiments described herein arenot intended to be exhaustive or to limit the scope of the invention tothe exact forms disclosed. Persons skilled in the art and technology towhich this invention pertains will appreciate that alterations andchanges in the described structures and methods of assembly andoperation can be practiced without meaningfully departing from theprinciples, spirit, and scope of this invention. Although relative termssuch as “inner,” “outer,” “upper,” “lower,” and similar terms have beenused herein to describe a spatial relationship of one element toanother, it is understood that these terms are intended to encompassdifferent orientations of the various elements and components of theinvention in addition to the orientation depicted in the figures.Additionally, as used herein, the term “substantially” and similar termsare used as terms of approximation and not as terms of degree, and areintended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art. Furthermore, as used herein, when a component is referred to asbeing “on” or “coupled to” another component, it can be directly on orattached to the other component or intervening components may be presenttherebetween.

What is claimed is:
 1. A rigid entry fitting configured to form a sealbetween a pipe segment and a sump wall at an aperture in the sump wallthrough which the pipe segment passes, the rigid entry fittingcomprising: a fitting body having an inner surface defining a taperedopening and an outer surface opposite the inner surface; an insertconfigured to be received in the tapered opening; a shell configured tobe received in an opening of the insert and defining an openingconfigured to accommodate the pipe segment; a first pair of gasketsconfigured to form a seal between an outer surface of the insert and theinner surface of the fitting body; a second pair of gaskets configuredto form a seal with an outer surface of the pipe segment; and a nutconfigured to engage the fitting body.
 2. The rigid entry fitting ofclaim 1, wherein, when the rigid entry fitting is assembled, the secondpair of gaskets contacts an inner surface of the insert and oppositeends of the shell.
 3. The rigid entry fitting of claim 1, wherein: thefitting body defines a first radial opening, the insert defines a secondradial opening, the shell defines a third radial opening, when the rigidentry fitting is assembled around the pipe segment and coupled to thesump wall, the first, second, and third radial openings define acommunication path from an interstice of the sump wall to the pipesegment.
 4. The rigid entry fitting of claim 1, wherein the fitting bodyfurther comprises a flange configured to be coupled to an exteriorsurface of the sump wall.
 5. The rigid entry fitting of claim 4, furthercomprising a flange configured to fit over the outer surface of thefitting body and configured to be coupled to an interior surface of thesump wall opposite the exterior surface of the sump wall.
 6. The rigidentry fitting of claim 1, further comprising a pair of annular groovesin the outer surface of the insert, the pair of annular groovesconfigured to accommodate the first pair of gaskets.
 7. The rigid entryfitting of claim 6, wherein, when the first pair of gaskets is receivedin the pair of annular grooves, the first pair of gaskets extend beyondthe outer surface of the insert.
 8. The rigid entry fitting of claim 1,wherein the nut comprises: a cap; an outer sleeve extending from thecap; and an inner projection extending from the cap.
 9. The rigid entryfitting of claim 8, wherein: the outer surface of the fitting bodycomprises outer threads; and an inner surface of the outer sleevecomprises inner threads configured to engage the outer threads of thefitting body.
 10. The rigid entry fitting of claim 9, wherein, when therigid entry fitting is assembled and the nut is threaded onto thefitting body, the inner projection of the nut engages an interior gasketof the second pair of gaskets.
 11. The rigid entry fitting of claim 1,wherein the second pair of gaskets is larger than the first pair ofgaskets.
 12. The rigid entry fitting of claim 11, wherein: the firstpair of gaskets comprises a first pair of O-rings each having a firstcross-sectional diameter, and the second pair of gaskets comprises asecond pair of O-rings each having a second cross-sectional diameterlarger than the first cross-sectional diameter.
 13. The rigid entryfitting of claim 1, wherein an outer surface of the insert tapers andsubstantially matches the inner surface of the fitting body when therigid entry fitting is assembled around the pipe segment.
 14. A rigidentry fitting configured to form a seal between a pipe segment and asump double wall at an aperture in the sump double wall through whichthe pipe segment passes, the rigid entry fitting comprising: a fittingbody having an inner surface defining a tapered opening and an outersurface opposite the inner surface, and a first radial opening extendingfrom the inner surface to the outer surface; an insert configured to bereceived in the tapered opening, the insert defining a second radialopening configured to be in fluid communication with the first radialopening; a shell configured to be received in an opening of the insertand defining an opening configured to accommodate the pipe segment, anda third radial opening configured to be in fluid communication with thesecond radial opening; and a nut configured to engage the fitting body.15. The rigid entry fitting of claim 14, further comprising: a firstpair of gaskets configured to form a seal between an outer surface ofthe insert and the inner surface of the fitting body; and a second pairof gaskets configured to form a seal with an outer surface of the pipesegment, wherein an exterior gasket of the first pair of gaskets and anexterior gasket of the second pair of gaskets define a first fluid-tightseal when the rigid entry fitting is installed around the pipe segment,and wherein an interior gasket of the first pair of gaskets and aninterior gasket of the second pair of gaskets define a secondfluid-tight seal when the rigid entry fitting is installed around thepipe segment.
 16. The rigid entry fitting of claim 14, wherein: when therigid entry fitting is assembled, the first, second, and third radialopenings define at least a portion of a communication path from aninterstice of the sump double wall to the pipe segment.
 17. The rigidentry fitting of claim 16, wherein the first, second, and third radialopenings are longitudinally offset from each other.
 18. The rigid entryfitting of claim 16, wherein, when the rigid entry fitting is installedaround the pipe segment, the first radial opening is at least partiallyaligned with the interstice of the sump double wall.